通过测定蠕变曲线及位错运动的内摩擦应力(σ0),研究了一种含Re单品镍基合金的蠕变行为,并计算出稳态蠕变期间的表观蠕变激活能及应力指数.结果表明:在稳态蠕变期间位错运动的内摩擦应力(σ0),随外加应力的提高略有提高,随温度的升高而明显降低.在蠕变初期,γ'相沿垂直于应力轴方向形成N型筏状结构,随蠕变进行,筏状γ'相发生粗化,且距离断口越近,筏状γ'相粗化及扭曲程度越严重,其中,由于颈缩使样品近断口区域承受最大有效应力,是使筏状γ'相粗化及扭曲加剧的主要原因.蠕变后期,合金的变形机制是位错剪切筏状γ'相.
参考文献
| [1] | 王开国;李嘉荣;曹春晓.单晶高温合金蠕变行为研究现状[J].航空学报,2004(07):3-11. |
| [2] | 田素贵,杨洪才,周惠华,张静华,徐永波,胡壮麒.一种单晶镍基合金高温蠕变相关参数的试验研究[J].东北大学学报（自然科学版）,1998(02):146-148. |
| [3] | TIAN S G;ZHOU H H;ZHANG J H et al.Creep behavior of single crystal nickel base superalloy[J].Journal of Materials Science and Technology,1998,14(08):751-756. |
| [4] | AHLQUIST C N;NIN W D .The measurement of internal stresses during creep of Al and Al-Mg alloys[J].Acta Metallurgica,1971,19:373-385. |
| [5] | RONAAULT-ROGEZ H;DUPEUX M;IGNAT M .High temperature tensile creep of CMSX 2 nickel base superalloy single crystals[J].Acta Metallurgica Et Materialia,1994,42(09):3137-3148. |
| [6] | WALTER W;MILLIGAN S;STEPHEN D et al.The mechanisms and temperature dependence of superlattice stacking fault formation in the single crystal superalloy PWA 1480[J].Metall Trans (A),1991,22:2309-2317. |
| [7] | 骆宇时,李嘉荣,刘世忠,孙凤礼,韩梅,曹春晓.Re对单晶高温合金高温高应力持久性能的影响[J].中国有色金属学报,2005(11):1655-1659. |
| [8] | GABRISCH H;MUKHERJI D;WAHI R P .Deformation induced dislocation networks at the γ'/γ phases interfaces in the single crystal superalloy[J].Philosophical Magazine A:Physics of Condensed Matter:Structure Defects and Mechanical Properties,1996,74(01):229-234. |
| [9] | GABB T P;DRAPER S L;HULL D R .The role of interfacial dislocation networks in high temperature creep of superalloys[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1989,118:59-65. |
| [10] | FELLER-KNIEPMEIER M;LINK T .Correlation of microstructure and creep stages in the (100) oriented superalloy SRR99 at 1253K[J].Metall Trans (A),1989,20:1223-1238. |
| [11] | 田素贵;周惠华 .一种单晶镍基合金蠕变期间γ'相的定向粗化机制[J].金属学报,1998,34(06):591-596. |
| [12] | SOCRATE S;PARKS D M .Numerical determination of the elastic driving force for directional coarsening in Nisuperalloys[J].ACTA METALLURGICA ET MATERIALIA,1993,41:2185-2193. |
| [13] | MULLER L;GLATZEL U;FELLER-KNIEPMEIER M .Calculation of the internal stresses and strains in the microstructure of a single nickel-base superalloy[J].Acta Metallurgica Et Materialia,1992,40:1321-1328. |
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